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Hope you've got lots of space in your DVR for this one. It's four hours long and packed with some of the most bizarre and potentially awesome (awful) pairings you can imagine, like Mick Jagger and Fergie, Metallica and Ozzy Osbourne, and Bruce Springsteen and Billy Joel. I'm most looking forward to Annie Lennox and Aretha Franklin doing "Chain of Fools."

I'm also excited because this never-ending format means that each performer will get to do more than one song, in fact, they get a whole set. It's the aforementioned Bruce Springsteen, Rolling Stones, Aretha Franklin and Metallica, plus Stevie Wonder, U2, Jeff Beck, Simon and Garfunkel and Crosby, Stills and Nash, who are featured and joined for a song by a variety of other contemporaries and current acts. It looks like there might be some great music to be had, if you can handle all four hours.

The concert special debuts on HBO at 8PM, and re-airs a bunch of times, so don't fret if you miss it the first time around.